下载图片出现了错

VM308:1 thirdScriptError Cannot read property 'fileid' of undefined; [Component] Event Handler Error @ pages/cloud/cloud#bound downloadFile TypeError: Cannot read property 'fileid' of undefined    at c.downloadFile (http://127.0.0.1:53690/appservice/pages/cloud/cloud.js:152:36)    at Object.o.safeCallback (http://127.0.0.1:53690/appservice/__dev__/WAService.js:15:2390)    at http://127.0.0.1:53690/appservice/__dev__/WAService.js:17:17303    at p (http://127.0.0.1:53690/appservice/__dev__/WAService.js:17:19574)    at http://127.0.0.1:53690/appservice/__dev__/WAService.js:17:18875    at n (http://127.0.0.1:53690/appservice/__dev__/WAService.js:6:8644)    at n (http://127.0.0.1:53690/appservice/appservice?t=1571473964403:1419:27790)    at e.exports.